Scaffolding device



Jan. 2, 1923. 15 4441 368 0' P. CHESEBRO. SCAFFOLDING DEVICE. ORIGINALFILED FEB. 15, 1915. 2 SHEETSSHEET I nue'wtoz $13 144 mic (meg storiesor more, and known as Patented Jan. 2, i923.

STATES htdfifid P AT fl ii DENISON P.- CHESEBRO, OF NEW YORK, N. 1.,ASSIGNOR TO AMERICAN SAFETY DEVICE COMPANY, A CORPORATION OF NEW YORK.

SGAFFOLDING DEVICE.

Application filed February 15, 1915, Serial No. 8,210. Renewed November11, 1918. Serial No. 261,941.

To all 10 ham it may concern:

Be it known that I, DENIso'N P. CHEsnBRo, a citizen of the UnitedStates, residing in New York, borough of Manhattan, county and State ofNew York, have invented certain new and useful Improvements inScaffolding Devices, of which the following is a specification.

' This invention relates to scaffolding devices for building, painting,decorating and like purposes, and more particularly scaffolding intendedfor structures of four, five or six stories in height, as distinguishedfrom taller buildings of eighteen or twenty skyscrapers. The object ofthe invention is to provide an improved scaii'olding device which issafe and efiicient, which may be readily installed and operated, and bymeans of which workmen are enabled to gradually ascend along the wallsof the building under construction, without necessitating the takingdown and building up and consequent waste of time, as in scaffoldingheretofore used employing wooden horses, posts, platforms, etc. Anotherobject is to provide a secure and safe scaffolding, and thereby do awaywith the many accidents which have here tofore resulted due to theinsecure method in which these former devices were arranged and builtup.

With these and other objects in view, my in vcntion consists of thenovel features, construction and arrangement of parts, hereinafter morefully described and pointed out in the claims.

In the accompanying drawings,

Figure l is a perspective view of my improved scaflolding device;

Figure 2 is a detail side view of one of the posts;

Figure 3 is a top plan View of one end of the scaffolding;

Figure 4 is a side view of a modified form of post;

Figure 5 is a front view thereof;

Figure 6 is a side view of another modified form of post; and,

Figure T is a plan view thereof, partly in section.

Similar reference characters indicate corresponding parts throughout theseveral views.

bars 3 suitably arranged between the same.

On each of the posts is mounted a slidable member 4:, provided at itsends with rings 5 engaging the posts. A worm 6 is suppor ed within thesaid slidable member by means of a shelf, orbracket 7, located betweensaid rings 5, the threads of the worm being adapted to engage the rackteeth of the post. The post 1 is made tubular so as to provide alongitudinal interior channel, at one side of which are located the rackteeth 2, and the grooves between the rack teeth communicate with, oropen into, the said channel, as will be seen in Fig. 3., which alsoshows that the threads of the worm 6 project into said channel. Thus anymortar, mud, or other foreign matter sticking to the teeth 2 will bereadily broken loose by the rotating worm and forced through saidgrooves into the interior of the post, where it will drop to the bottom;some of the matter thus loosened will also drop on the outside of thepost. The shaft of the said worm extends upwardly through the slidablemember, and is provided with a ratchet 8 or other suitable means forturning the worm. It is obvious that by operating the worm by means ofthe ratchet in opposite directions the slidable member is either raisedor lowered as desired. A supporting bar or putlog 9 is pivotally securedat its ends 10 and 11 to the slidable members 4 of each pair'of postsand a platform 12 is laid over the several bars 9. thereby completingthe scaffolding.

The pivotal connection between the ends of the supporting bar 9 and themembers t. is such that the bar or putlog 9 is unrestrained above thepivotal points to permit the bar to assume atransverse obliquelyinclined position in the independent operation of the clamping devicesor jacks arranged upon the posts or columns 1.

In the modified form of construction shown in Figures i and 5' a rack 13is secured lengthwise to a post 1% and a slidable member having a wormas above described is mounted thereon.

In Figures 6 and 7 I have shown a form of construction wherein posts 15of channel iron are employed, inclined teeth 16 being provided along themedial portions, thereof to form a perpendicular rack, cooperating witha ratchet operated worm 17 supported in the slidable member 18.

In this form the ends of the slidable members are provided withapertures 19 to coniorm to the channel iron, a projecting portion"20being'provided therein for supportingt he upper end of the worm. Inthis torm of my invention, also, the lifting worm projects into theinterior channel of the post andflengages the rack teeth, located insuch channel, and will readily loosen foreign matter from betweentheteeth and cause it to drop within the'channel of the post.

The operation of my improved scaffolding device is as follows: WVhen itis desired to raise or lower the scaffolding, the rate-hots 8 areoperated, thereby turning the worm and moving the slidable memberscarrying the supporting bars and platform up or down as desired.

I have illustrated and described preferred and satis'fiactory forms ofmy invention, but it is obvious that changes may be made therein, withinthe spirit and scope thereof, as definedin the appended claims,

1. A scaffolding device comprising posts, each provided with rack teeth,a' lifting element provided with upper and lower members embracing therespective-post and slidable thereon lengthwise, a bracket locatedbetween said members, a lifting member journaled in said bracket and inone of the sliding members, to turn about an axis parallel to the post,said lifting member engaging the rack teeth of the post, and means forturning said lifting member.

2. A s'cafiolding device comprising posts, each provided with alongitudinal interior channel and with rack teeth at one side of suchchannehand a lifting element slidable lengthwise of eachpIostandincluding a rotary lifting member extending into the channel of thepost and engaging the teeth thereof to raise or lower said element bythe rotation of the lifting member.

.3. A scaffolding device comprising tubular posts each provided at oneside withrack teeth and with grooves located between said teeth andcommunicating with the interior of the post, and a lifting elementslidable lengthwise of each post and including a rotary lifting memberhaving portions adapted to engage said teeth and to project through saidgrooves into the interior of the post, and .toraise .or lower saidelement by the rotation of the lifting member.

l. Incombination, a plurality of pairs of columns, independentlyoperable climbing means on each column, putlogs connecting the climbingmeans on each pair of columns to each other,each putlog having a freelypivotal connection at its opposite ends to the respective climbingmeans, to permit of the individual operation thereof, andan appreciablelongitudinal travel of said climbing means upon the respective columnswith relation to each other, and a platform supportedby the putlogs. 7

5. In cor'n'binati-im,v a plurality of hairs of columns, independentlyoperable climbing means on eachlcolumn, a putlog' pivot-ally connectedat opposite ends to the climbing means on each pair of columns and beingunrestrained above the pivotal points for alternately step by stepmovement of opposite ends of the. putlog, and aplatform supported by theputlo-gs.

6. A scaffolding comprising four or more columns adapted'to form askeleton tower, parallelogrammatic in plan, put-logs connecting thecolumns in pairs and bracing the sameas tower elements and forming platform supports, and individual climbing means for each columneach'connected to one end of the put-log and having a lost motionconnection so that either end of the put-log may be shifted vertically asubstantial distance independently of the other end thereof, saidclimbing means being operable from a platform carried by said put-log.

in testimony that I claim the foregoing as my invention, I; have signedmy name in presence of two subscribing witnesses. DitNISON P. CHESEBRO.

Witnesses F. Hose, Jos. BISBANS.

